MM water pump

My '41MM RTI kept over heating. I replaced the radiatorstill overheats. I just took it all apart for total restoration and the water pump is pretty basic, Impellers are moving freely with nothing else to inhibit performance. What else would cause overheating? No thermostat.

Head gasket beginning to leak can let hot combustion air from one or more cylinders into coolant with no missing or other symptoms (often will run OK with no load on engine but heat under load/going uphill etc...but try all the cheapest/easiest fixes first...

Two things not mentioned are:If you do put a new thermostat in the top radiator hose, make sure it has a hole in it to allow some water to go through or it will boil before the thermostat opens. 1/8" hole is fine.A thermostat for an 8N ford works.R's and Z's have what is refered to as a BAFFLE (RE521) around the impeller. If it is missing, the engine will sometimes run hot.

Check your ignition timing and the mechanical advance. If the timing is running retarded, it will heat up quick. Tocheck the advance, remove distrib cap, grab the rotor and give it a flip. It should move some and then snap back. The works under the breaker plate may be rusted up.

Thermostat should be some place in line with the top radiator hose. You could also have a block that is full of rust and lime and needs to be flushed. My self I use white vinegar. Drain the system and fill with vinegar and run it till hot. Let cool and drain then flush with water from a garden hose. Best way is to rig up a way to use the block drain to flush it

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